General Structure of a C# Program (C# Programming Guide)
Visual Studio 2012
C# programs can consist of one or more files. Each file can contain zero or more namespaces. A namespace can contain types such as classes, structs, interfaces, enumerations, and delegates, in addition to other namespaces. The following is the skeleton of a C# program that contains all of these elements.
// A skeleton of a C# program using System; namespace YourNamespace { class YourClass { } struct YourStruct { } interface IYourInterface { } delegate int YourDelegate(); enum YourEnum { } namespace YourNestedNamespace { struct YourStruct { } } class YourMainClass { static void Main(string[] args) { //Your program starts here... } } }
For more information, see the C# Language Specification. The language specification is the definitive source for C# syntax and usage.